$ cargo run the poem.txt
   Compiling minigrep v0.1.0 (file:///projects/minigrep)
warning: unused `Result` that must be used
  --> src/main.rs:19:5
   |
19 |     run(config);
   |     ^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled
   = note: `#[warn(unused_must_use)]` on by default

warning: `minigrep` (bin "minigrep") generated 1 warning
    Finished dev [unoptimized + debuginfo] target(s) in 0.71s
     Running `target/debug/minigrep the poem.txt`
Wyszukiwanie kto
W pliku poem.txt
Z tekstem:
Jestem nikim. A ty kim jeste?
Czy take - jeste - nikim?
A wic dwoje nas? Nic nie mw,
bo ogosz to z krzykiem.

By kim - jakie to aosne.
Imienia swego nie pragn
jak aba w czerwcu ycia gosi
przed zachwyconym bagnem.

